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Cygnus X-3 is a high-mass X-ray binary with a compact object accreting matterfrom a Wolf-Rayet donor star. Recently, it has been revealed by the ImagingX-ray Polarimetry Explorer (IXPE) as a hidden Galactic ultra-luminous X-ray(ULX) source with a luminosity above the Eddington limit along the direction ofa narrow (opening angle <~32 degree) funnel. In between the IXPE observations,we observed Cyg X-3 with the European VLBI (very long baseline interferometry)Network at 22 GHz and the NICER X-ray instrument. To probe possible relationsbetween the X-ray funnel and the potential radio jet from the ULX, we analyzedthe simultaneous multi-wavelength data. Our high-resolution VLBI image revealsan elongated structure with a position angle of -3.2+/-0.4 degree, accuratelyperpendicular to the direction of the linear X-ray polarization. Because CygX-3 was in the radio quiescent state on 2022 November 10, we identify themas-scale structure as the innermost radio jet. The finding indicates that theradio jet propagates along and within the funnel. Moreover, the jet ismarginally resolved in the transverse direction. This possibly results from thestrong stellar winds and the rapid orbital motion of the binary system.

The innermost jet in the hidden ultra-luminous X-ray source Cygnus X-3